ᐅ Gas with solar thermal? Or heat pump with photovoltaic? Advice needed
Created on: 5 Feb 2020 08:57
M
Micha8589
Good morning to the forum,
I have been researching heating options for quite some time and have gathered a few opinions, which have only made me more uncertain about my decision. That’s why I thought I’d ask the forum.
My family (2 adults, 1 child) is planning to build the following single-family house at the end of this year or beginning of next year:
Single-family home with pitched roof
Approximately 115 m² (1,237 sq ft)
Solid construction (calcium silicate brick ground and upper floors, brick-clad)
No KFW standard
Building location: southern Mecklenburg
Unfortunately, I can’t provide an energy performance certificate or heating load calculation yet, as the preliminary offer is still being prepared. I am also aware that a general statement can’t really be made since every house and heating behavior is individual.
The construction company advised us to install a modern hybrid heating system consisting of a gas condensing boiler and two solar thermal panels on the roof for domestic hot water, as the initial costs are relatively low (plus installation of the central gas connection), and this technology has proven reliable. The entire house is planned to have underfloor heating. According to the company, they have had very positive experiences with this and consider the technology future-proof. (There is also the idea of a fireplace in the living room.)
On the other hand, I think gas prices will not get any cheaper in the future, and the topic of CO₂ taxes (especially concerning the fireplace) worries me somewhat.
In theory, I would prefer to install a geothermal heat pump combined with a suitable photovoltaic system because this would make me independent of fossil fuels and allow me to heat “off-grid” to a certain extent, depending on efficiency. However, I am hesitant because of the very high initial costs and don’t really know how these compare to operational costs. I also can no longer realistically assess which technology offers the best cost-performance ratio (except for air-source heat pumps).
As you can see, I am completely undecided and hope to get some feedback and expertise from the forum.
Thanks in advance for your replies.
I have been researching heating options for quite some time and have gathered a few opinions, which have only made me more uncertain about my decision. That’s why I thought I’d ask the forum.
My family (2 adults, 1 child) is planning to build the following single-family house at the end of this year or beginning of next year:
Single-family home with pitched roof
Approximately 115 m² (1,237 sq ft)
Solid construction (calcium silicate brick ground and upper floors, brick-clad)
No KFW standard
Building location: southern Mecklenburg
Unfortunately, I can’t provide an energy performance certificate or heating load calculation yet, as the preliminary offer is still being prepared. I am also aware that a general statement can’t really be made since every house and heating behavior is individual.
The construction company advised us to install a modern hybrid heating system consisting of a gas condensing boiler and two solar thermal panels on the roof for domestic hot water, as the initial costs are relatively low (plus installation of the central gas connection), and this technology has proven reliable. The entire house is planned to have underfloor heating. According to the company, they have had very positive experiences with this and consider the technology future-proof. (There is also the idea of a fireplace in the living room.)
On the other hand, I think gas prices will not get any cheaper in the future, and the topic of CO₂ taxes (especially concerning the fireplace) worries me somewhat.
In theory, I would prefer to install a geothermal heat pump combined with a suitable photovoltaic system because this would make me independent of fossil fuels and allow me to heat “off-grid” to a certain extent, depending on efficiency. However, I am hesitant because of the very high initial costs and don’t really know how these compare to operational costs. I also can no longer realistically assess which technology offers the best cost-performance ratio (except for air-source heat pumps).
As you can see, I am completely undecided and hope to get some feedback and expertise from the forum.
Thanks in advance for your replies.
T
T_im_Norden11 Feb 2020 09:02Electricity export balance, meaning more exported than imported:
2017: 55 TWh (terawatt-hours)
2018: 51 TWh
2019: 36 TWh
In 2017, 27 TWh were imported.
I have no data for 2018/19.
2017: 55 TWh (terawatt-hours)
2018: 51 TWh
2019: 36 TWh
In 2017, 27 TWh were imported.
I have no data for 2018/19.
ttiggerin schrieb:
You wrote that you have a gas heating system and additionally a heat pump for cooling—did I misread that? No, you understood that correctly.
T
ttiggerin11 Feb 2020 10:42Mycraft schrieb:
No, you understood that completely correctly.Could you tell me more about that... I'm just getting started, but this is the first time I've heard of it. Why did you do it? Economically, it certainly doesn't make sense, does it?Due to my professional experience with various heating and cooling systems, we have a gas boiler as the primary heat source in the house.
The heat pump is used solely for cooling because summers are getting hotter, and the cooling effect from the underfloor heating system alone is negligible.
From an economic perspective, it makes sense in our case, as the initial investment costs were manageable and the annual operating costs for both systems are around 1000 (currency). The indoor temperature remains consistently between 22 and 24°C (72 and 75°F) throughout summer and winter.
The heat pump is used solely for cooling because summers are getting hotter, and the cooling effect from the underfloor heating system alone is negligible.
From an economic perspective, it makes sense in our case, as the initial investment costs were manageable and the annual operating costs for both systems are around 1000 (currency). The indoor temperature remains consistently between 22 and 24°C (72 and 75°F) throughout summer and winter.
guckuck2 schrieb:
I find a 35% increase in gas prices over six years quite significant. You assume that the base price for gas will remain the same and that about 1.6 cents will be added on top. That’s your crystal ball speaking.
Mine says something will happen with the gas price once the Russian at the other end of Nord Stream II fully opens the gas valve. Everyone can imagine what those additional 100 billion cubic meters of H-gas will do to the gas price.
guckuck2 schrieb:
Yes, it will, and noticeably so. Your entire argument seems to be based on the oversimplification that the electricity price consists solely of the wholesale market price and the renewable energy surcharge. Currently, these make up only about 40% of the retail price. You conveniently ignore the exploding grid fees and concession costs caused by the “all-electric society.” These currently account for 25% of the electricity price and, as mentioned, will skyrocket in the coming years, more than offsetting the few cents added by the renewable energy surcharge. That’s what my crystal ball says.
T
T_im_Norden11 Feb 2020 13:55Mycraft schrieb:
The heat pump is used for cooling because summers are getting hotter, and the cooling effect through the underfloor heating system is negligible.I’m interested in this as well. How did you set it up? Is the heat pump connected to the underfloor heating in summer?
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